Cap for a pen



FIG. 1 is a front perspective view of a cap for a pen showing my new design;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a left side elevational view thereof, the right side elevational view being a mirror image of the left side elevational view;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a rear view thereof; and,

FIG. 8 is a front perspective view in an open position.

The broken lines are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a cap for a pen, as shown and described. 